Modeling and optimization of creep behavior of Ni-based superalloys GTD-111 and IN-738LC using central composite design

[+] Author and Article Information
O. Ganji

Vakil-Abad Blvd. Mashhad, 91775 Islamic Republic Of Iran o_ganji@yahoo.com

A. R. Shadman

Vakil-Abad Blvd. Mashhad, 91775 Islamic Republic Of Iran a.shadman@um.ac.ir

S. A. Sajjadi

Dept. of Materials Sci. and Eng., Ferdowsi University of Mashhad, Vakil-Abad Blvd. Mashhad, 1175-1111 Islamic Republic Of Iran sajjadi@um.ac.ir

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received January 9, 2018; final manuscript received February 14, 2019; published online xx xx, xxxx. Assoc. Editor: Harley Johnson.

ASME doi:10.1115/1.4043159 History: Received January 09, 2018; Accepted March 05, 2019


In this study, the effects of temperature, stress and type of materials and their interactions on the creep rate and rupture time were investigated by using central composite design (CCD). An experimental plan for CCD with two numerical factors and one categorical factor and two levels was used to optimize the required number of experiments. Temperatures of 800°C and 900°C and stresses of 250 and 450 MPa were selected as factors for GTD-111 and IN-738LC superalloys. Experimental and numerical results showed that the main effects of factors and their interactions are significant on the creep rate and rupture time. Among all factors, the effects of temperature and stress dominated other factors. Moreover, it was indicated that interaction between temperature and stress is much more effective on creep rate response than on rupture time. The high creep rate and the low rupture time values were obtained at highest stress and temperature for IN-738LC. With the same experimental condition, creep rate values were the most and rupture time values were the least for IN-738LC versus GTD-111.

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